Michelle Dockery has teased that 'Downton Abbey 3' is a "beautiful" film with a touching tribute to the late Dame Maggie Smith.The 43-year-old actress - who plays Lady Mary Talbot (née Crawley) – says fans are in for a real treat with the third and final film based on the hit period drama series.Maggie’s alter ego, Dowager Countess, passed away in the second movie, 2022's 'Downton Abbey: A New Era', and following her own passing in September, at the age of 89, the final flick has become all that more poignant for the cast.Michelle told Collider: "It’s a beautiful film. For us, it was such a treat to be able to come back together again. It’s a real tribute to Maggie Smith, the film."American actor Paul Giamatti, 57, has reprised his role as Harold Levinson from a 2013 episode, and Michelle loved working with him again.